Aw: Re: Metadata size limitations of btrfs

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[...] 
> > Here the requested information of my fs (after removing a lot of build
> > directories):
> >
> > franzbroetchen# uname -a
> > Linux franzbroetchen 4.0.0-1-amd64 #1 SMP Debian 4.0.2-1 (2015-05-11) x86_64 GNU/Linux
> > franzbroetchen# btrfs --version
> > btrfs-progs v4.0
> > franzbroetchen# btrfs fi show
> > Label: 'root' uuid: 57fe2100-0510-11e5-977e-0021ccb48233
> > Total devices 1 FS bytes used 182.55GiB
> > devid 1 size 467.68GiB used 206.06GiB path /dev/mapper/franzbroetchen_vg-root
> 
> Hmm. You shouldn't be seeing any kind of ENOSPC with this
> allocation -- there's plenty of space for it to allocate from. I think
> you've hit the horrible undiagnosed bug which prevents the FS from
> allocating more space. I know josef was looking at this one but kept
> getting distracted by data-corruption issues. He may be able to
> comment more on it.
> 
> Given the information above, I'm not sure that the usage=5 or
> limit=3 suggestion I made above will have any benefit for you.

No, I've tried this in the past without any success. I think I went up to usage=90
(without any limit) and it had no affect. I would guess that the problem is
an allocation problem for the metadata because enough free space for allocation
was available.
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